Sediment trap for filters provided with magnetic means



March 2, 1948. P. G. cox EIAL 2,437,221 7 SEDIMENT TRAP FOR FILTERPROVIDED WITH MAGNETIC MEANS Filed Nov. 18, .1945 j 2 Sheets-Sheet 1'INVENTOES 2 Rae/(ER (2 Cox fi m/5 f-Z fiANSEN March 2,v 1948. P. c;-.vcox ET AL SEDIMENT TRAP FOR FILTER PROVIDED WITH MAGNETIC mamas- FiledNov. 18, 1943 2 Sheets-Sheet 2 INVENTOE5 Cox PARKER HA/vs A PatentedMar. 2, 1948 SEDIlWENT TRAP FOR FILTERS PROVIDED WITH MAGNETIC MEANSParker G. Cox and Hans Albert Hansen, Detroit,

Mich., assignors to Bendix Aviation Corporation, South Bend, 11111., acorporation of Delaware Application November 18, 1943, Serial No.510,736

7 Claims. (01. 210-165) This invention relates generally to apparatusfor filtering fluids and has particular reference to magnetic filteringdevices.

It is an important object of this invention to provide a filter forfiltering various types of fluid such as fuel, oil and the like whereinthere is means for removing particles of steel, iron and rust, which maybe entrained in the fluid. This feature is particularly important incases where a magnetic control valve is used to control the fluid flow,the magnetic filter being, of course, on the upstream side of saidvalve. 7

Another object of the invention is toprovide a device of this characterthat may be easily assembled and readily disassembled for cleaning orother purposes.

Still another object of the invention is to provide a device of thischaracter having a simple, novel and effective means for securing anelement retainer nut so as to prevent accidental loosening thereof.

A further object of the invention is to provide a device of thischaracter having an effective and compact magnet; novel and reliablemeans for mounting said magnet; and efiecting means for retaining samein place so as to prevent vibration and rattling thereof. 7 r

A still further object of the invention is to provide a. device of thischaracter having means for minimizing the loss-of fluid when the bowl isremoved for cleaning or other purposes.

Another object of the invention is to provide a device of this characterwherein the improvements consist of certain novel details ofconstruction and combinationsand arrangements of parts.

Still another object of this invention is to provide a device of thischaracter that is effective, reliable and eiflcient in operation andthat is simple and durable in construction.

The characteristics and advantages of the invention are furthersufficiently referred to in connection with the following detaileddescription of the accompanying drawings, which represent a preferredembodiment. After considering this example, skilled persons willunderstand that many I scope of the appended claims.

In the drawings: Figure 1 is a vertical section of a filter deviceembodying the invention;

Figure 2 is a plan view of the magnet assembly per se';

Figure 3 is a plan view of the filter bowl;

Figure 4 is a, side view of the bowl; and

Figure 5 is a vertical section of the element nut and retainer cupassembly.

Referring more particularly to the drawings the device comprises afilter head l having an outlet passage l2 extending horizontallytherethrough adjacent the top thereof, as shown in the drawings, andhaving threaded outlet opening-s l4 and .I the latter being closed by athreaded plug l6.

Beneath the passage 12 is a chamber l8 having a threaded inlet adaptedto be connected with a source of fluid. Opposite the inlet. 26 is a second threaded passage 2| into the chamber 13 which is normally closed byplug 22 screwed therein. The chamber l8 and passage l2 are con= nectedby a passage 24 in a partition 25 separating'said chamber and passage.If desired the head may be provided with laterally extending ears 26 forattachment of the device to some convenient support. A stud bolt 28v isthreaded into a, hole in the top of the filter head and a filter element30, preferably of the edge type, is received on the stud 28 and coversthe pas-sage 24, said element 30 having internal, longitudinallyextending passageways (not shown) which communicate with passage 24.. Anelement retainer nut 34 is adapted .to retain the element 39 in itsoperative position against the underside of the partition 25, therebeing an element retainer cup 36 interposed between said nut and filtere1e ment for closing the lower end of said filter element. Details ofthe element nut and retainer cup are more particularly shown in Figure 5and it will be noted that the nut 34 has a shoulder 38 on which thecup,36 rests. A flange 40 extends through the bottom of the cup and thefree end of said flange is peened or overturned slightly to preventseparation of the cup and nut, the 'cup being adapted to turn freely onthe nut. The nut also includes downwardly inclined and outwardlyextending knurled pins 42 which are pressed into openings in the nutprovided therefor, the purposes of said pins being hereinafterdescribed. The stud 28 extends downwardly beneath the nut 34 and isadapted to receive a bowl '44 thereon which may be of any suitablematerial such as brass or the like, or if desired may be of somesuitable transparent material. The bowl which may be of any suitabletype, is shown as having a roundedbottom portion 45 with a dependingsump 48, best shown in Figure 4, and within the sump a reinforcingmemnormally closed by a plug 52. A tube 54 extends upwardly from thebottom of the bowl, being brazed orotherwismsecured thereto, and. isdisposed about the studz'28, the purpose of said tube being hereinafterdescribed. The bowl is retained in position relative to the head Iii bya,

bowl nut 56, there being a gasket 58 between the nut 56 and the bottomof the.-.bow1;to;prevent leakage thereabout. The upper end of the.bowl... is flanged outwardly at 60 toform a surfaceof,

substantial area adapted to abutagainstagasket 52 in an annular recess63 in'the, lower end, of the head In to provide a seal between saidbowland head. With the bowl thus secured in position the element retainernut 34 is=prevented from'rotating on the stud (except to a limitedandunimportant extent) by awlug 64 brazed or otherwisesecuredto theinsideoithe bowl and extending inwardly thereof into the path of saidpins 42 so as to engage. onemor theother. of the pins 42 thus preventinaccidental loosening of the nut and thelfllteringelement 3.0 dueto-vibration-and the like. A magnetisflisposed in the bowladjacent, thebottom thereof and generally comprises adisk-like body Hlhavin ea notchl zthereinto permitlug- ,64 topasstherethrough in assembling,orjdisassembling the device. The magnet 70 islprovided. withlanlaxial'ho-le. M which is tapered as best shown..in.1=igure..1, and acup.- like base or.support V 16 is. provided for the mag. net, the ,base.beingota non-magnetic m t i preferably die; cast..m.e.tal; which.iscast into the hole 14 ofvthemagneth The large diameter, portion, ofthe hole. .14, is disposedupwardly. so, that whenthe diecastimetaliislcasttherein a wedge arrangement is .providedwhichprevents.v separation of-the magnetefromgthe support, the lower bodyportion of which isbelowthernagnet and has a shoulder. abutting aportion of the under side of said, magnetadl'aicent theesmallend of hole74. The magnet ,andsupport-are. slidably disposed on the tube 54andsaidlsupportis providedwith an, enlarged axial, opening"; extendingfrom the upper end, the sides-of said opening being. spaced from thetube, to accommodatethe lower end of, a spring 80 ,which is disposed'aboutthetube 54% and reacts between the element nutsd and. an annularshoulder 82; adjacent the bottom of said supportwhich slidablyengagessaiditube 54,. The spring sills secured'in the support .16 by ascrew S4and is adaptedto retain the magnet in position adjacent the bottomoi thebowlandprevents rattling or vibration. thereof.

Operation In operation, fluid; which may be gasoline, oil orv the like,enters the. inlet 20, and: passes into the chamber, 8, throughtheefiltering passages of the. filter element 30-, lon itudinal fluid;passages (not shownljnthe: interior of ,said element, through the.passage-24., into the message, i 2 and thence ,isdischarged throughthe,outlet l4. Some ofthe fuel from, the cha-mber; I 8-fi11s-the bowl andparticlesof metalsuchmasisteel, iron and/or rust which are entrained. inthe fluid entering the device are drawn to theemagnet 10 and retainedtherebyto prevent their returning; to the fluid stream. It is tobenoted. thatthemagnet creates a magnetic fleldin thebowl so that; theparticles of magnetic material entrainedimthefuel are accelerated towardthemagnet.

Should ,it vbe desired, to remove. the: sediment,

metal particles attached to the magnet and the like, the fluid supply iscut off and the bowl nut 56 removed from the stud 28. The bowl may thenbe removed from the stud, together with the magnet, its support and thespring 80. There will be some.l0ss 0f fluid whemthebowlis removed butthe quantity is reducedito. a minimum due to the tube 54 which preventsescape of fluid below the level of the upper end thereof. Should it bedesired to also clean the element 38 said element may bez-removed byunscrewing the elementretainer nut 34. After removal of the filter itcan then be cleaned in the usual manner.

It is to be noted that the filter head is so arrangedasto be. connectedin a fluid conduit for filtering fiuid flowing from left to rightthrough the device as shown in the drawings. However, ifit is: desiredto connect the device to filter fluid flowing in the opposite direction,the plug 22 is removed and screwed into the opening 2%! and plug I6 isremoved and screwed into the outlet opening 14'.- Theappropriate connee:tions with the'fluid conduit areth'en made and the device is operablein;substantially the .same mannerashereinbeforedescribed. Also, ifdesired, a pluralityof-suchdevicesmay be'supplied with filtered fluid byconnecting each of saiddevices to the respectiveoutlets l4 andlii.vThusa variety of connection combinations are. possible with the presentdevice.

It is thought, that the. inventionand many of itsattendant advantages.will be, understood from the foregoing description andlthough saidinvention has been-illustrated andidescribed'in connection with-a singleembodiment thereotit will be apparent that-various changes may be madein the form, construction and arrangement of the parts withoutdepartingifrom the spirit and scope of"the-inventionor sacrificing allof its material advantages, the form hereinbefore described being merelya preferred embodiment.

We claim:

1. In a, magnetic'filterfor fluids: a head having an inlet and amoutlet; an edge type filter element interposed between-the inlet'andoutlet; a bolt received through the filter element and having one endsecured to the head; means for retaining the filter element inpositioncomprising a nut and retaining cup rotatably secured thereto andinterposed between said nut and the filter element; a plurality ofpins'fixed to the nut and extending outwardly thereof; a bowl receivedon the bolt and securedto the headbeneath'the filter element,therebei-ng'a fluid passage connecting the inlet and the'interior of thebowl; a stop member fixed to the interior of the bowl and positioned inthe path of the pins when the nut is in its element retaining position;an imperiorated tube extending-upwardly from the bottom of the bowl anddisposed about-the bolt, said tube having its upper-end disposedadjacent the plane of the top of the-bowl; a-magnet; a support for themagnet, received onthetube and positioned adjacent the bottomoflthebowl, said support being of nonemagnetic material and supporting themagnet inspacedrrelationship relative to the bet tom of .sa-idabowl;arropening;in;;the;support ex tending fromatheupperend. thereef, theinterior wallsof said opening being; in: spaced" relation to the tube; aspringabout the tube, extending into the opening in the support and.reacting between said support and the nutto retain the support andmagnet in position adjacent the. bottom of. the bowl.

2. In a filter for fluids;, a, head havingan enlarged chamber with aninlet and an outlet therefor; a filter element interposed between saidinlet and outlet; a bolt secured to the head; a bowl received on thebolt and having an open end in sealed relationship with the head; afluid passage between the enlarged chamber and the bowl; a magnetdisposed within the bowl adjacent the bottom thereof and spaced from thesides of said bowl; resilient means adapted to retain the magnet in itsposition adjacent the bottom of the bowl; and means of non-magneticmaterial for insulating the magnet from the resilient means, bolt andbowl.

3. In a filter for fluids: a head having an inlet and an outlet; afiltering element interposed between said inlet and outlet; a bowlhaving a hole in the bottom thereof depending from the head; a passageconnecting the inlet and the interior of the bowl; a tube secured to thebot tom of the bowl over said hole and extending upwardly therefrom, theupper end of said tube being adjacent the plane of the upper end of thebowl; a bolt received in the tube and secured to the head; and a nut onthe outer end of the bolt for securing the bowl to the head; said tubebeing adapted to prevent any substantial loss of fuel when said bowl isremoved from the filter.

4. In a filter for fluids: a head having an inlet and an outlet; an edgetype filtering element interposed between said inlet and outlet; a bowlof non-magnetic material depending from the head; a passage connectingthe inlet and the interior of the bowl; a tube secured to the bottom ofthe bowl and extending upwardly therefrom, the upper end of said tubebeing adjacent the plane of the upper end of the bowl; a bolt extendingthrough the tube and secured to the head; a nut on the outer end of thebolt for securing the bowl to the head; a magnet adjacent the bottom ofthe bowl and disposed about the tube; means supporting said magnet onthe bottom of said bowl; and a spring about the tube engaging saidsupport to retain the magnet in position.

5. The invention defined by claim 3 including a magnet disposed aboutthe tube spaced from the walls of the bowl; a magnet support ofnonmagnetic material disposed about the tube and positioned on thebottom of the bowl for insulating the magnet from said tube, saidsupport having an opening receiving said tube and a shoulder adjacentsaid opening; and a spring encircling said tube and engaging saidshoulder to retain the support in position on the bottom of the bowl.

6. In a filter for fluids: a head having an inlet and outlet; a filterelement interposed between the inlet and outlet; a bolt received throughsaid filter element and having one end secured to the head; a nutreceived on the bolt and adapted to secure the filter element; outwardlyextending members on the nut; a bowl on the bolt; means for retainingthe bowl in position; and a fixed stop member within the bowl disposedin the path of the nut members.

7. In a filter for fluids: a head having an inlet and an outlet; an edgetype filter element interposed between the inlet and outlet; a boltreceived through said filter element and having one end secured to thehead; a nut received on the bolt and adapted to secure the filterelement in position; an outwardly extending member on the nut; a bowl onthe bolt; means for retaining the bowl in position; a fixed stop memberon the bowl disposed in the path of the nut member; and a magnetdisposed on the bolt and positioned adjacent the bottom of the bowl,said magnet being provided with a peripheral notch adapted to permit thestop member to pass therethrough in assembling the filter.

PARKER G. COX. HANS ALBERT HANSEN.

REFERENCES CITED The following references are of record in the NumberName Date 1,745,248 De Guenther Jan. 28, 1930 1,768,367 McKinley et al.June 24, 1930 1,744,837 Pelleti-er Jan. 28, 1930 1,797,399 Boulade Mar.24, 1931 2,014,800 De Guenther Sept. 17, 1935 2,032,828 Attwood Mar. 3,1936 2,141,436 Harris Dec. 27, 1938 2,322,131 Heftler June 15, 19431,602,935 Rasey Oct. 12, 1926 1,263,406 Hadley Apr. 23, 1918 2,117,361Rohrbach May 17, 1938 1,606,356 Risher Nov. 9, 1926 2,031,936 Cuno Feb.25, 1936 2,320,725 Hautzenroeder June 1, 1943 2,068,394 Burckhalter etal. Jan. 19, 1937 2,188,643 Laderer Jan. 30, 1940 FOREIGN PATENTS NumberCountry Date 272,784 Great Britain June 23, 1927

